Help with derivative to plot graph

I am trying to plot the derivative of my vector function with another vector but it seems that it wont run because I know that after you derive it would n-1. How do you resolve this problem?

Vtdc = 4.2105*(10^-5);

B = 77;

S = 85.8;

a = S/2;

l = 136.5;

%Solution;

Theta = 0:360;

y = l+a-(sqrt((l^2)-(a^2).*(sind(Theta)).^2)+a.*cosd(Theta));

U = diff(U)

plot(Theta,U)

[David Hill]

plot(Theta(1:end-1),diff(y));%assume you wanted y...what is U? Just end Theta 1 less.

Answer 1

[Gouri Chennuru]

Hi Rasiq,

As a workaround, you can use the following code,

Vtdc = 4.2105*(10^-5); 
B = 77;    
S = 85.8;  
a = S/2;  
l = 136.5; 
Theta = 0:360;
y = l+a-(sqrt((l^2)-(a^2).*(sind(Theta)).^2)+a.*cosd(Theta));
plot(Theta(1:end-1),diff(y));

Hope this Helps!